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I'm working on a local development environment (via Acquia Dev Desktop). Our theme is a subtheme of the Stack theme.

In this situation, I'm making changes to my .theme file, but they don't seem to be loading at all. If I make the same changes to the stack.theme, they load and work as expected.

I've ensured I'm using function <subtheme>_theme_suggestions_page_alter but still no luck. There is nothing in the error.log either.

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    Please, check if you have setted your sub-theme correctly according drupal.org/docs/8/theming-drupal-8/… . Especially check availability a string base theme: <your core theme machine name here> in your-theme.info.yml .
    – V.Vil
    Nov 27, 2017 at 16:54
  • Have you tried clearing your local cache? If you are looking for ways to troubleshoot, have you tried printing an HTML tag to the page or adding a log message using Drupal Watchdog in your page alter hook? This way you can log something like "hook ran" to see if it runs by checking your Watchdog log messages.
    – usernameabc
    Nov 27, 2017 at 19:11
  • Not sure if it was the cache, but per @V.Vil the sub-theme was setup correctly. I'd already tried clearing the caches, but no luck. I downloaded a fresh copy of the database from the Acquia environment, cleared the caches again, and it started working.
    – JMichael
    Jan 18, 2018 at 20:02
  • @JMichael in some situations i had to clear cache if i created a new hook. Updates tending to show up. Additional local setting can be drupal.org/node/2598914
    – usernameabc
    Jan 18, 2018 at 22:27

1 Answer 1

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Got it fixed on my local environment by putting the base theme name in quotes and then clearing the cache.

Changed base theme: classy to base theme: "classy".

Also, check for a single quote on your theme's description. If you find it, make sure you put the whole description in quotes.

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    No need of quotes. It should work without quotes as well.
    – Renuka Kulkarni
    Oct 6, 2020 at 7:56
  • Can confirm this fixed an issue in my theme. Haven't dug into why, but it had me scratching my head when my preprocess function wasn't firing... sure enough, I had classy without quotes as the base theme.
    – Tyler Fahey
    Jan 6, 2021 at 3:42
  • Thank you . This helped me to get my .theme file recognized. Without the double quotes the .theme file is ignored! I do not understand why. Is there any official Drupal issue about this?
    – drupalfan
    Mar 16, 2021 at 16:54
  • Quotes don't make a difference, but trailing whitespaces do! In Yaml something like key:value is the same as key: value, but key:value is NOT the same same as key:value
    – Hudri
    Apr 23, 2021 at 10:30
  • Thank you! My .theme file only started loading after putting classy in quotes (single quotes)! Weird. After getting it to load I could remove the quotes and it still works, so the actual mechanism must be something else.
    – Kari Kääriäinen
    Apr 24, 2021 at 23:08

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